CFI Code (Classification of Financial Instruments) Regex for JavaScript

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching cfi code (classification of financial instruments), ported and verified for JavaScript. Financial data validation has zero tolerance for false negatives — a missed invalid entry can corrupt downstream calculations. The snippet below is ready to drop into your JavaScript project — whether you're validating in an Express middleware, a Next.js API route, or a client-side form.

Javascript Implementation

// CFI Code (Classification of Financial Instruments)
// ReDoS-safe | RegexVault — Finance > Securities & Trading

const cfiCodeClassificationOfFinancialInstrumentsRegex = /^[A-Z]{6}$/;

function validateCfiCodeClassificationOfFinancialInstruments(input: string): boolean {
  return cfiCodeClassificationOfFinancialInstrumentsRegex.test(input);
}

// Example
console.log(validateCfiCodeClassificationOfFinancialInstruments("ESXXXX")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Finance > Securities & Trading category and carries a ReDoS-safe certification. That matters for JavaScript developers because especially critical in long-running Node.js event loops where a ReDoS vulnerability can block the entire process. RegexVault audits patterns against known backtracking attack vectors, ensuring you have the necessary context before using this regex in a high-stakes production environment.

Common Pitfalls

Technical Notes

CFI codes classify financial instruments. First char: E=equity, D=debt, R=rights, O=option, F=futures, C=collective investment, P=structured, T=referential. X means 'not applicable/defined'. Used in ANNA (ISIN authority) systems.